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QuestionDouble glazed window won't open. Can it be fixed?

We have a double glazed window but the window won't open. The handle moves but it does not unlock the window. Locked or unlocked with the key makes no difference. I think the metal plate inside that moves up and down has broken off as I had to fix another window which broke while open. This one has broke while closed so can it be fixed or would we have to replace the whole window? Thanks for anyones help.